sunxi: fix H616 DRAM ODT support

Kconfig symbol is missing CONFIG_ prefix, so compiler will always
skip ODT configuration.

Fix symbol name.

Fixes: f4317dbd06b6 ("sunxi: Add H616 DRAM support")
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/arch/arm/mach-sunxi/dram_sun50i_h616.c b/arch/arm/mach-sunxi/dram_sun50i_h616.c
index acdfb3c..76f520f 100644
--- a/arch/arm/mach-sunxi/dram_sun50i_h616.c
+++ b/arch/arm/mach-sunxi/dram_sun50i_h616.c
@@ -720,7 +720,7 @@
 	writel(0x80, SUNXI_DRAM_PHY0_BASE + 0x3dc);
 	writel(0x80, SUNXI_DRAM_PHY0_BASE + 0x45c);
 
-	if (IS_ENABLED(DRAM_ODT_EN))
+	if (IS_ENABLED(CONFIG_DRAM_ODT_EN))
 		mctl_phy_configure_odt();
 
 	clrsetbits_le32(SUNXI_DRAM_PHY0_BASE + 4, 7, 0xa);